3D discrete dislocation dynamics applied to a motion of low-angle tilt boundaries
Result description
This paper presents a 3D discrete dislocation dynamics (DDD) model describing dislocation processes in crystals subjected to loadings at high temperatures. Smooth dislocations are approximated by short straight segments. Every segment is acted upon by aPeach-Koehler force obtained by summing up forces from all dislocation segments and a force due to the applied stress. The model addresses interactions between individual dislocations and rigid precipitates. The model is applied to a migration of low angle tilt boundaries (LATBs) characterized by different initial dislocation density and constrained by precipitates of different sizes. The calculations showed that, for applied shear stresses _xz lower than a certain threshold _crit:(h), the LATB is inhibited by the precipitate field. For _xz above _crit:(h), the LATB passes through the precipitate field. Some combinations of _xz and h lead to a decomposition of the LATB. The LATBs thus may evolve in three distinct modes depending on the
Keywords
3D discrete dislocation dynamicslow-angle dislocation boundariesparticle strengtheninghigh temperature deformationOrowan stress
The result's identifiers
Result code in IS VaVaI
Result on the web
DOI - Digital Object Identifier
Alternative languages
Result language
angličtina
Original language name
3D discrete dislocation dynamics applied to a motion of low-angle tilt boundaries
Original language description
This paper presents a 3D discrete dislocation dynamics (DDD) model describing dislocation processes in crystals subjected to loadings at high temperatures. Smooth dislocations are approximated by short straight segments. Every segment is acted upon by aPeach-Koehler force obtained by summing up forces from all dislocation segments and a force due to the applied stress. The model addresses interactions between individual dislocations and rigid precipitates. The model is applied to a migration of low angle tilt boundaries (LATBs) characterized by different initial dislocation density and constrained by precipitates of different sizes. The calculations showed that, for applied shear stresses _xz lower than a certain threshold _crit:(h), the LATB is inhibited by the precipitate field. For _xz above _crit:(h), the LATB passes through the precipitate field. Some combinations of _xz and h lead to a decomposition of the LATB. The LATBs thus may evolve in three distinct modes depending on the
Czech name
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Czech description
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Classification
Type
D - Article in proceedings
CEP classification
JG - Metallurgy, metal materials
OECD FORD branch
—
Result continuities
Project
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2014
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Article name in the collection
Materials Structure and Micromechanics of Fracture VII
ISBN
978-3-03785-934-6
ISSN
1013-9826
e-ISSN
—
Number of pages
5
Pages from-to
87-91
Publisher name
Trans Tech Publications
Place of publication
Zurich
Event location
Brno
Event date
Jul 1, 2013
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
000336694400016
Basic information
Result type
D - Article in proceedings
CEP
JG - Metallurgy, metal materials
Year of implementation
2014